Pipe coupling



FIG. 1 is an isometric view for our design for a pipe coupling;

FIG. 2 is a front view thereof, the rear view being a mirror imagethereof;

FIG. 3 is a left side view thereof, the right side view being a mirrorimage thereof;

FIG. 4 is a top view thereof; and,

FIG. 5 is a bottom view thereof.

The broken lines represent portions of the pipe coupling that form nopart of the claimed design. The pattern of circles on the top and bottomof the pipe coupling are in broken line and form no part of the claimeddesign.

CLAIM We claim the ornamental design for a pipe coupling, as shown anddescribed.